Claims
- 1. An acid-free, aqueous catalyst paste with a solids content of 30 to 70% by weight and containing dialkyltin oxide and a water-thinnable cationic binder vehicle, obtained bya) dispersing dialkyltin oxide in an acid-free aqueous dispersion or solution of one or more hydroxycarboxylic acid salts of bismuth(III) in a weight ratio of tin to bismuth, calculated as the metal, from 1:3 to 3:1, and b) comminuting the preparation obtained with one or more cationic binder vehicles in a weight ratio of dialkyltin oxide plus hydroxycarboxylic acid salt of bismuth(III) to cationic binder vehicle from 0.5:1 to 6:1.
- 2. A catalyst paste according to claim 1 wherein step b) is carried out in the presence of one or more pigments and/or extenders, wherein the weight ratio of the sum of pigment, extender, dialkyltin oxide and hydroxycarboxylic acid salt of bismuth(III) to cationic binder vehicle is 0.5:1 to 6:1 and the weight ratio of pigment plus extender to dialkyltin oxide plus hydroxycarboxylic acid salt of bismuth(III) is 0.3:1 to 60:1.
- 3. A catalyst paste according to claim 1, wherein steps a) and/or b) are carried out in the presence of organic solvents and/or of one or more customary lacquer additives.
- 4. A catalyst paste according to claim 1, wherein the dialkyltin oxide is dibutyltin oxide.
- 5. A catalyst paste according to claim 1, wherein the hydroxycarboxylic acid salt of bismuth (III) is a salt of lactic acid or of dimethyolpropionic acid.
- 6. A catalyst paste according to claim 1, wherein the cationic binder vehicle is a customary cationic paste resin or binder vehicle for cathodic electro-dip lacquers.
- 7. A process comprising using a catalyst paste according to claim 1 in cathodically depositable electro-dip lacquers.
- 8. A process for coating electrically conductive substrates comprising cathodic electro-dip coating, wherein an electro-dip lacquer is used which contains a catalyst paste according to claim 1.
- 9. A process for producing an acid-free, aqueous catalyst paste vehicle with a solids content of 30 to 70% by weight and containing dialkyltin oxide and a water-thinnable cationic binder, comprising:a) dispersing the dialkyltin oxide in an acid-free aqueous dispersion or solution of one or more hydroxycarboxylic acid salts of bismuth (III) in a weight ratio of tin to bismuth, calculated as the metal, from 1:3 to 3:1, and b) comminuting the preparation obtained in step (a) with one or more cationic binder vehicles in a weight ratio of dialkyltin oxide plus hydroxycarboxylic acid salt of bismuth (III) to cationic binder vehicle from 0.5:1 to 6:1.
- 10. A process according to claim 9, comprising carrying out step b) in the presence of one or more pigments and/or extenders, wherein the weight ratio of the sum of pigment, extender, dialkyltin oxide and hydrocarboxylic acid salt of bismuth (III) to cationic binder vehicle is 0.5: to 6:1 and the weight ratio of pigment plus extender to dialkyltin oxide plus hydrocarboxylic acid salt of bismuth(III) is 0.3:1 to 60:1.
- 11. A process according to claim 9, comprising carrying out steps a) and/or b) in the presence of organic solvents and/or of one or more customary lacquer additives.
- 12. A process according to claim 9, wherein the dialkyltin oxide is dibutyltin oxide.
- 13. A process according to claim 9, wherein the hydroxycarboxylic acid salt of bismuth (III) is a salt of lactic acid or of dimethyolpropionic acid.
- 14. A process according to claim 9, wherein the cationic binder vehicle is a customary cationic paste resin or binder vehicle for cathodic electro-dip lacquers.
- 15. A process comprising:using a catalyst paste produced by a process of claim 9, in cathodically depositable electro-dip lacquers.
- 16. A process for coating electrically conductive substrates, comprising cathodic electro-dip coating, wherein electro-dip lacquer is used which contains a catalyst paste produced by a process of claim 9.
Priority Claims (1)
Number |
Date |
Country |
Kind |
196 13 685 |
Apr 1996 |
DE |
|
Parent Case Info
This application is the national phase of international application PCT/EP97/01651 filed Apr. 2, 1997 which designated the U.S.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/EP97/01651 |
|
WO |
00 |
10/2/1998 |
10/2/1998 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO97/38056 |
10/16/1997 |
WO |
A |
US Referenced Citations (9)
Foreign Referenced Citations (7)
Number |
Date |
Country |
2062272 |
Sep 1992 |
CA |
44 34 593 A1 |
Apr 1996 |
DE |
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Jul 1991 |
EP |
0 469 497 A1 |
Feb 1992 |
EP |
0 507 086 A1 |
Oct 1992 |
EP |
0 509 437 A1 |
Oct 1992 |
EP |
WO 9324578 |
Dec 1993 |
WO |
Non-Patent Literature Citations (1)
Entry |
Patent Abstracts of Japan, vol. 018, No. 004 (C-1149), Jan. 6, 1994 and JP 05 247385 A (Sep. 24, 1993). |